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| • | Take
advantage of the smoothness of most |
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| frequency-dependent
phase changes. |
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| • | Expect
phase changes ~f for
atmosphere and |
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| cables,
~f -2 for the ionosphere. Frequency- |
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| independent
phase offsets are also possible. |
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| • | Lobe
ambiguities need not be a driver for time |
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| between
phase calibrations (although linearity |
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| of
phase changes will be). |
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| • | Care
must be taken to calibrate frequency-to- |
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| frequency
amplitudes (self-cal is no help). |
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